In the early days of video games, much of the industry made money 25 cents at a time. But today's video game moguls aren't counting quarters, they're making millions. Some of them rank among the richest people in the world.

Last week, Forbes released its annual ranking of the world's richest people, a list of 1,826 individuals who boast a net worth of a billion dollars or more. Only two people in the video game business have reached those lofty heights so far. But with the global video game market expected to hit $90 billion by 2016, we know there are more ten-figure fortunes on the way.

So we decided to dive a little deeper, into the still-rarefied ranks of hundred-millionaires, to find the richest video game moguls. These lucky seven sit at the top of that list. They're the designers, engineers and entrepreneurs who are making the games we love to play --and making big money in the process.

Gabe Newell (Photo: Rich Dahms for Forbes)

Gabe Newell, Valve - $1.3 billion

One of the most respected figures in the video game business, Newell owns more than 50% of Bellevue, Wash. software firm Valve. Its digital distribution platform Steam is the industry's most important digital sales channel, and its original games (including the Half-Life, Portal and Left 4 Dead franchises) are beloved by critics and fans alike. Next up: competing with Xbox, PlayStation and Wii in an effort to put "Steam machines" into living rooms, and developing Vive, a virtual reality headset.

The cofounder and former CEO of Zynga isn't worth near as much as he was during the salad days of FarmVille, when shares peaked at over $14.50 a pop. Now they're under $3, but early investments in Napster, Twitter and Facebook are keeping Pincus flush.

Melvyn Morris, King Digital - $627 million

Morris made his first fortune creating dating site Udate.com and his second as chairman and cofounder of the London-based casual game studio behind the smash hit Candy Crush Saga. He resigned his post as chairman of King in November.

Riccardo Zacconi, King Digital - $548 million

Another Candy Crush millionaire, King's Italian CEO has led the company since its inception--but he and his fellow cofounders have seen their fortunes shrink since a March 2014 IPO.

Palmer Luckey (Photo: Gabriela Hasbun for Forbes)

Palmer Luckey, Oculus VR - $500 million

The inventor of the Oculus Rift virtual reality headset sold his company to Facebook for $2 billion when he was just 21. No one in history has ever made a fortune that big that young. Now working on the first consumer version of the product, expected later this year. To find out more, check out the January 19, 2015 Forbes Magazine cover story, Palmer Luckey: Defying Reality.

Ilkka Paananen, Supercell - $400 million

CEO and cofounder of a blazing-hot Finnish game studio. Few companies are able to create a hit as big as Supercell's flagship title, Clash of Clans--and almost none have been able to repeat that success, like Paananen did with Boom Beach.